SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
yonsei-campus.com
SSL/TLS Certificate
SSL/TLS Certificate for yonsei-campus.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- yonsei-campus.com
- Valid from
- Sep 19, 2026
- Valid until
- Dec 18, 2026 (81 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0605A30E56BA4A11E2BC7A2A65D5CE609E8F
- SHA-256 fingerprint
- 48:94:56:67:7F:42:1F:CA:05:58:25:32:BF:5D:61:1A:63:A7:A9:E4:1C:D8:C7:1C:5B:52:A1:66:03:FF:8F:46
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by yonsei-campus.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch yonsei-campus.com continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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